FRC FDPs were made in one dental laboratory on the full arch plaster cast. The model was first isolated with two coats of isolation medium. One unidirectional pre-impregnated E-glass fibers (Vectris- Ivoclar Vivadent, Lienchestein) was used to reinforce the veneering composite. Each bundle consists of about 4000 glass fibers, with a diameter of 1.7 mm, embedded in a PMMA/bis-GMA matrix. Before the fibers were placed on the cast, a layer of composite was applied into the interproximal-occlusal box of the abutment teeth. The fiber bundle was placed in the bed of the flowable resin using metal hand instruments.